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38 lines
1.4 KiB
C#
38 lines
1.4 KiB
C#
using SixLabors.ImageSharp;
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using SixLabors.ImageSharp.ColorSpaces;
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using SixLabors.ImageSharp.ColorSpaces.Conversion;
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using SixLabors.ImageSharp.PixelFormats;
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namespace CompatBot.Utils.Extensions;
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internal static class Converters
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{
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private static readonly ColorSpaceConverter ColorSpaceConverter = new();
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public static Color GetComplementary(this Color src, bool preserveOpacity = false)
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{
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var c = src.ToPixel<Rgba32>();
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var a = c.A;
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//if RGB values are close to each other by a diff less than 10%, then if RGB values are lighter side,
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//decrease the blue by 50% (eventually it will increase in conversion below),
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//if RBB values are on darker side, decrease yellow by about 50% (it will increase in conversion)
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var avgColorValue = (c.R + c.G + c.B) / 3.0;
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var dR = Math.Abs(c.R - avgColorValue);
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var dG = Math.Abs(c.G - avgColorValue);
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var dB = Math.Abs(c.B - avgColorValue);
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if (dR < 20 && dG < 20 && dB < 20) //The color is a shade of gray
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{
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if (avgColorValue < 123) //color is dark
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c = new Rgba32(220, 230, 50, a); // #dce632
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else
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c = new Rgba32(255, 255, 50, a); // #ffff32
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}
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if (!preserveOpacity)
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a = Math.Max(a, (byte)127); //We don't want contrast color to be more than 50% transparent ever.
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var hsb = ColorSpaceConverter.ToHsv(new Rgb24(c.R, c.G, c.B));
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var h = hsb.H;
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h = h < 180 ? h + 180 : h - 180;
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var r = ColorSpaceConverter.ToRgb(new Hsv(h, hsb.S, hsb.V));
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return new Rgba32(r.R, r.G, r.B, a);
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}
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} |